In computing, a serial port is a serial communication interface through which information transfers in or out sequentially one bit at a time.[1] This is in contrast to a parallel port, which communicates multiple bits simultaneously in parallel. Throughout most of the history of personal computers, data has been transferred through serial ports to devices such as modems, terminals, various peripherals, and directly between computers.
Jan Axelson Parallel Port Complete Pdf 56
The 9-pin DE-9 connector has been used by most IBM-compatible PCs since the Serial/Parallel Adapter option for the PC-AT, where the 9-pin connector allowed a serial and parallel port to fit on the same card.[4] This connector has been standardized for RS-232 as TIA-574.
On Windows, you open a file named COM1 (or \\.\COM1 on some flavors) with the CreateFile() function, and then get it configured and happy with functions like SetCommState() and the DCB structure. The details are similar in broad outline to the things you need to do on *nix, but organized completely differently. You can find the whole discussion of configuring and using COM ports at MSDN. 2ff7e9595c
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